There is hereby created the West Virginia Municipal Police Officers and Firefighters Retirement System. The purpose of this system is to provide for the orderly retirement of certain police officers and firefighters who become superannuated because of age or permanent disability and to provide certain survivor death benefits. Substantially all of the members of the retirement system shall be qualified public safety employees as defined in section two of this article. The retirement system shall come into effect January 1, 2010: Provided, That if the number of members in the system are fewer than one hundred on January 1, 2017, then all of the provisions of this article are void and of no force and effect, and memberships in the system will be merged into the Emergency Medical Services Retirement System created in article five-v, chapter sixteen of this code. If merger is required, the board shall take all necessary steps to see that the voluntary transfers of persons and assets authorized by this article do not affect the qualified status with the Internal Revenue Service of either retirement plan. All business of the system shall be transacted in the name of the West Virginia Municipal Police Officers and Firefighters Retirement System. The board shall specify and adopt all actuarial assumptions for the plan at its first meeting of every calendar year or as soon thereafter as may be practicable, which assumptions shall become part of the plan.